Lack of receptor for advanced glycation end products attenuates obesity-induced adipose tissue senescence in mice

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The receptor for advanced glycation end products (RAGE) and its ligands are critical drivers of adipose tissue inflammation. While RAGE expression increases in ageing cells and pathological conditions, its specific role in high-fat diet (HFD)-induced adipose tissue senescence remains to be fully elucidated. In this study, we investigated the function of RAGE in the development of adipose tissue senescence associated with obesity. We observed that HFD-fed RAGE-deficient (RAGE−/−) mice exhibited significantly reduced body weight and adipocyte hypertrophy compared to wild-type (WT) controls. At the molecular level, RAGE−/− mice displayed lower mRNA expression of cell cycle regulators and markers of the senescence-associated secretory phenotype. This anti-senescent phenotype was accompanied by decreased reactive oxygen species (ROS) production and elevated expression of anti-oxidant genes. Mechanistically, the lack of RAGE resulted in the upregulation of silent information regulator type 1 (SIRT1) in adipose tissues. Notably, the inhibition of SIRT1 reversed these anti-senescent effects and attenuated anti-oxidant gene expression in RAGE-deficient mice. Furthermore, while antioxidant treatment with N-acetylcysteine (NAC) reduced p53 in WT mice, it failed to fully suppress p16 and p21, whereas NAC treatment in RAGE−/− mice significantly downregulated all senescence markers, suggesting a synergistic protective effect. In conclusion, our results demonstrated that RAGE deficiency improved anti-oxidant properties and prevents adipocyte senescence via the SIRT1 signalling pathway, highlighting a potential therapeutic target for obesity-associated tissue dysfunction.

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